<!DOCTYPE html>
<html>
<head>
  <title>Video Player Test</title>
  <meta name=viewport content='width=device-width initial-scale=1.0'>
</head>
<body>
  <video controls id=video src=bear.webm controlsList='noplaybackrate noremoteplayback' disablePictureInPicture></video>
  <button id='fullscreen'>fullscreen</button>
</body>
<script>
  document.querySelector('#fullscreen').addEventListener('click', _ => {
    document.querySelector('video').webkitRequestFullscreen();
  }, { once: true });
</script>
</html>
